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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da13de75e770360f18b81a371bf30a9e39a278e5d6e6f26b9c2a056cc6201139' 
  AND token = 'tA3Gr6SFBiBEVxg24SPdSYJ5qPQzi3U/5cbVX2Op+VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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