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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9302d403593f60c31e95f07c21e45715caeccebcde4782c3515548866d5471' 
  AND token = 'D7q/ClK6dS4uObtM5B2IYY+0UzJviecAt+Z1mJCazSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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