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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f86bbc3a3ba1df03d2ad36c7e6567b819585b77e489ba155d9776dc423bfe25' 
  AND token = 'oOzP2fAxybnTRl0yeat/rucxkEhZ2+DwmQmR4daO9Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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