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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a693686e1e924bb7ca7bdce29c9bb05096cf9ac4bf1d345d84a9b7d8e040e3d5' 
  AND token = '69bhA426472A87vY+xgBJmJGk3NfTtNNwFbqeOCYx7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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