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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0f296501b6c038e0a4cc9121a7678443989bb513f3270ef5f353d0936f198f' 
  AND token = 'UNF8+9U9L9c7uXXwuKnpfobxcVHui8R0/DaH6mAxa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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