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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88970759fcb89ce516ec09f1d6953c4ed29f2ee4af63aafaabf1c7157787957f' 
  AND token = 'IEQM/aInAhr6xkHpLyblNVcJRJe5PQsF9JyAaErWxAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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