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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2792aeb7a856a9ef889b2d61907956ab66ec0866a16d1caa36908c316d69030c' 
  AND token = 'b64fII9XiuT8AmE3NUbZmoWNAD+9RJL0V4H6phj+w+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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