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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fdb8f42efbc6a1566d85f0dc958cfaa961bc60f2da1bfa5dfb972e1aab3dc7' 
  AND token = 'F1Zk351xl2hbix2LPgq6pR1YZIoWwu9i9h6clq0lVBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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