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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dc3680ee7ee31c2544ac29701123cec8b936fe9d0b2cee8d0f723acd6c90b6' 
  AND token = 'ZKGKP6C97AuL9EXB2mvX9Yc8OUDA68WwDQ7F4CYrwe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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