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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b3883d490998b07e10df6e36a08bf6b3b9705c0c11f91dec882781e755228b' 
  AND token = 'Y5UaXEYTfF1VfLeXwcBhmwHTAyzPyiP4XYomtwELntw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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