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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d3ba5744f967f0e6fff3fb9db5867dcdbba5471f808a6521572dc77575f1c7' 
  AND token = 'XeZuy2LoeVJLM6BwUt7waKNI0y+7jMjXicSyLkx9ICg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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