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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7533e25c8b581fc3d61fe63fd920c6f207f19240a93de84c84edd30adf55ce3' 
  AND token = 'OhdrLyVRQLmmKVQoNWjC7MBTke+WkbzrdBlO8q8MND8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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