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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc71e0c41d55edb925ca5742d17034b47c51ec1b0dd53aa1791665f56e90f31b' 
  AND token = 'OnR/s03jQ7hKnndQkfAlahneT7ohcCQSgga2DldMXPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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