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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9083ed89e64394edd22659fb2bb9dae84443436886a2b716618a8280c841271' 
  AND token = 'ZR+ssu0C3vHUjiSKM8rYw4kg+zhglmfc32HfMn30l6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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