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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bfad19b8ee7e148ec0a894ea2f5a77564c917266dddc0570f90be42bc47e19' 
  AND token = 'rf9j1GJTk3BW6eaLvbAmmyuu4J5wL6O95a116yxIudM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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