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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1772bc60f913f243f1a0e1005844eb5a8f87fe82628e22ccd8047b7b95fb8cc' 
  AND token = 'n11mhZjFszLqtS/V/l0k3skz1kcKUJ4zL5VrCAcHrIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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