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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c5ddb670803cc64b5a192d3d8d581d70ee3d9c9e7c22f7ed9a5e5fce86843b' 
  AND token = '+oAIyhwSHTehEQfjCFD9UruzQS3GMDmlfgbKpkh1j7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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