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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e11ed381e7e7a6faed2f3964ccc76a306e13e354a69e8d828ee7f73d26af890' 
  AND token = 'TS5qjzUK6xY3eE+wsnUvizPIOOilAoAz4nMms+RllVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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