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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004e733190d273e6d9290f6090c35bc574d86fef0f06cb558392d9d366161ae6' 
  AND token = 'sC5Lx+H6pN1NX7OEEjuqWZNsb4u8k85HD3A1tf+nAKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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