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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c974ffef3e6a69174c37b507f3722fc522f44a8ff2adf502ceed7e44a3f9082' 
  AND token = 'wJSfkWYoapyljapBNi9ndf4K0affum6XDd/fZHrkeEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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