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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b1bb4a28c7383a0155aea8eed6641c8470a4f7b7e4072acf4075f5f41564f5' 
  AND token = 'IUhKggyUAa1B81cdi1vAUFSd5pBB8zmBl77vzkv36Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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