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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5502598775ad81630b85d4b84121766f316357b5d6e675792118bac1dbb881d5' 
  AND token = '0aFepQiLgCwZk7k9v3Ygd+c6J9mvFnR3S97MPdN95Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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