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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1737da0cd399ec63373f4c4b54d9bc7387c09123c20562d28e69c19c47dafb' 
  AND token = 'ss8GRvZ7fufgtqkpkr7AnNn/z+qucn72P2IOA3+fQi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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