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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305b72ac63f8680aeb290b4e37379b90931faadb51d094670f6b2da4dc8b1c28' 
  AND token = 'OJx4PcIE3j76KNY7ja5Lz7zyKluJEhpXsCTieFH4fQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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