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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dffe8e9dcd979694b90b5edee6202528e75c86b25940ab2e3a61ec7d2144b1' 
  AND token = 'j384nBIgL+Yqe55aI1J1yakmCTrabETMwWJiF+2/MTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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