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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90616e995236c4d1cb3bedb2973e8749080d9fdf26b0f0139f9a0f60b1b6cfdb' 
  AND token = 'ukkyG+J3rJrHQMpEfP9FpzBHWcrWJu8kF8YBiP3wcSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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