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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa32c2adf458500c1e79325725a1c6a2e7885425d4d2dae48fb05c0d56a8ee0' 
  AND token = 'GOFrEzi7xTrOWDhxmv/vZfMUTxxgxl7WeLaeq5ytzLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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