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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f96295e08005f4cd6e0fd2326f6898c874b9360a26b7f361cbcceee3b5decb6' 
  AND token = 'gGBv/qPfqoQpyp3ftiraHxhbaSfMqWN92olRgqlQ5+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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