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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f58b80ba756cc79fcae0cd5fb38a062596ecac51741d56f6513203c04968c' 
  AND token = 'SIsIk8L3JYQFUEjY2B1Tz7x96i3oIWtj91ESnElCI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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