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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503de135c0965f8f8add97ddc39947b793d44637f05643306ebc58908e8e95bc' 
  AND token = 'noJAp00vmPZV20zSom2HEDFaVZfYkN3dYFcUml8fvuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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