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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f7044ca63e9ff0ccc26d59081f2e664c0717d7f118e6ca925050e3ad22ac39' 
  AND token = 'dZVK9mhzCeEk55Uq29QmoG+mOwFJa+MV07Dqnvpym9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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