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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebb79ba5ad2a880cf6343771bf7658965eed2c66d5dd71cae2af4417f509f6c' 
  AND token = 'yDrdkca78RM8VOrTq1D9RT2LbU9WbumJDI1aBW6rN5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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