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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a383e502b80fddeefe5dbea4a96cf417605f0bacc6f835d31d1ae9b7882ae79' 
  AND token = 'Rf/vjtmQj3Xj02/HomXsByfgvLHb5O8+fo/jRpCYzGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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