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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a728a34b3c0f5a3ed85c783ac3f80d9ac3b59de0a0b318cfe4a07061d774560' 
  AND token = 'YPiaSaRAFbTzkRFNecg7RW4Vik6FUU8rPl18ezmgJCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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