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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54fc9f40ab9b1a2482036fdf26d373b6fb34cf481799d1f8b4ea82559a0ef08' 
  AND token = 'zCLvoQnNNBjs6fMSC/yoUyPj/H7DVP9jsSc83ZiyWp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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