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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea3a5bbe08a7df9e567593ad2de268115b722a69680265ea0d481d5268aeaa1' 
  AND token = 'H3XGeQIV2qnzo2bvKBnGASIZuodJ3wMp9U1omojLw9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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