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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c56ed9962f7f9bcb660108a8f4102c05d62feb048aeef03cb6a424d4b35ac7' 
  AND token = 'cohDPa0n8lI8q/izZWutjcxcYTnrNHSthWF/0WNSWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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