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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03beeb4cb837c01f2205da4beafbf751cd2e18b2649c3d9c5071b375da775d7' 
  AND token = 'K74SU/XkP9C0XhanJwkL3aGrB83b9TL0vkSngXDS6Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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