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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8f5fbd852b84916596f948fa8c93c6e93785a7a0a92dfcdd0ed5e9ee564cca' 
  AND token = 'd4xtneP/kIrIRal1JO2nAsiFzSTqLi+wXfX7pud9p+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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