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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513cae9e9cba0f97828fce8957af7f81d722dfb91e740b3c4ee2c6da74a150f6' 
  AND token = 'xiNu6ozBWtM4NNsqo1NblUPm3S753ay67xRYX8koR+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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