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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f2e2fc49675644966312d4ab685d79571fdf15ded4aeac4800583a6406dc07' 
  AND token = '9yk+WwslQiY/b4qpPK6idDpcbNS1MqsoUOvG+STC/9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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