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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cfcc9a9f573b6b88af714ea094614bb6f5128c3210500f0b6328f94e029494' 
  AND token = 'bl+iPeht+dN0jJRgDpDFmawHXLNAHhnc1ZqvqXap0Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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