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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff03dd7f1f22b22b8e611bb18c63e5aab0f6755be9a778dda47d62c6042443b0' 
  AND token = 'PMnvg4oeQ8G5IZyoe26WjkYWR2cdUf2muzAM0zMqv70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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