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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd6f3beb170f3460b5a3e844317b99341adf5ba3e76e81af0ec8ce4507d5fce' 
  AND token = 'u9rpgTj+ybcy/16tLDK37ZsThuNf2D5fcbkeVC64sU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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