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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c27b0a98c1e0eb0825cf48a9c366d6f8a8c55c0527ba8fa6bb9fe7d922789f' 
  AND token = 'G65bnMNvvWHpUQhkixuGvKUfFgcH/ryk3ldEb2x5Yb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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