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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f641de36f247d0ba6ebebf4857f7d52ac5c47c71b368b2db1c646640ccbe3e4' 
  AND token = 'a94uWNica6mm0D/4sDbiudkncsa9VWXGxW82ceJPNgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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