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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510fa05bb385c668d3c1621fd251cced0944a7c2f68d2071f9cec47e9a0fc871' 
  AND token = 'bdTQG50xPhh3f2G+KsYqW2puxNVmgS5YuV35F1NLIeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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