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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd15cf60a87a4c40d47f5f4db1413d48eb0d8990f8ce0a6a5fe8d3a836a0db8' 
  AND token = 'OqERRL5hMljzvmlCAuj6wC6LIiAG5curoHy1CGsKXBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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