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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73c9bbb1ed62598a3cbc9ffa51cbccbd39fb40d26dc5faa6e622e5f5428635d' 
  AND token = '9H6Yd61kWGywmD+0DDkUrOQVpnOf2IZt2Z25g0RJVeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}