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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79526d6ec27f6d17c97f566f4cb10896d610e9f2ee7c019851e876ac3f5970e5' 
  AND token = 't11G640rcEnDA/aNJyZbWRGbIU7WFtWG6ymhX1RimeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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