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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fc76c9238065cc211f65291d9cfd4babc0f817fb10d79aca482716dc829ab3' 
  AND token = '8zG3UgNE4XIm8XSpPFvX9G0hKnsJu3T9iokmEHTqSDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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