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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66ff1b7ce32393f48f29de12347ab3ccb594f21ed4f2781f3553acb83c0b88a' 
  AND token = 'r2en05ZAj/+jv2FZm8xo2mfwgA16/67SomTR3zjHDSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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