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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5533ba5917fda4799f44e6565b76752fb7ab20b6bfb1800990677fd35ec84bf7' 
  AND token = 'DK8Po1TLP3StUaSxNgWmFylB4nxPjZAl393Kb2J1YEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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