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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493d90c76235cbed344240c3b1c78b73dc8a88c1fbd87c8d6bf60600d5c81fdd' 
  AND token = '8lathqHmzMAfb6B9lI3mxAVjjNQNhnVCLe8nViqLOi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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