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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daae48692d9fcb03516a8bb235669b13e08e5b49670879b589aacb542ee51004' 
  AND token = 'qj8LZIiocp3M6dUmOKg66ERGFSq0DRRl8oIuVCurAPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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