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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0171bcccfdc2e3348229becd227b0c4a7f2b76f4ac2cb2f4f3056251dd9be9a' 
  AND token = '1mlw58vRO3W6xCI4C0+4bIaANUYXiyi3x2v1hRoHsBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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