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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a2a184748ecd48f3a7f9a88e785dd29114fee35ce6f2cb30cfd0d780832cc4' 
  AND token = 'cRkrtiq1MJyXtyWpmUXYKaaQzK3gdUCKuG0PQd/S/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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