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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2eef6fbdfbfba8ed92e3c97b7a3ebb2389827a76f1bc6162411fec9a39abd4' 
  AND token = 'KASQL5fttOTHY0FH8+mqzbNj8EhVLXoRccGLUd97eaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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