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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a8b9bbd99bcaf4daa841465097fef865ad9a0964e31875f9949990258da4b' 
  AND token = 'DpUjWcAofTGurexESPWA8NJdNMzlZbw9IkRZVQo+0l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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