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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb2495bb41ed99151fe2c08f2785eea2dcc9f6f97dc59e63d8e87270811eca6' 
  AND token = '58KTbaljQ8DRfZn7uPvo+6y3APJgJWrol4Ra/6W7TnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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