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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccc66edb23ef823e71e89b31e2da764409499109a9d5d7a41851bd1dfc45951' 
  AND token = '3x5TXzke92gv9ycH9IEPiDHGIM59hfcAi9TeOSClgFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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