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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadfd930503d426d00f52605f57de79fc3d410f44d8a3520531f44b0f869ffd8' 
  AND token = 'WS2s6cdo9kx8G5/UkOe6fxSfa69RS2TBhPFTFaq6uwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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